Two national chains catering to youthful shoppers are opening stores at Spokane Valley Mall. Build-A-Bear Workshop Inc., a store where kids and adults put together customized stuffed animals, is opening on the main floor next to PacSun on Aug. 10. Hollister Co., an apparel store geared toward youths ages 14 to 17, will open on the main floor across from Victoria's Secret later in August, according to Lesa Berry, marketing manager for the mall.